Production of basic aluminum chloride



atentcd Jan. 1, i946 PRODUCTION (BF BASIC AL CORWE Ernest H. Kastning,

to William lit. Warner & Co. 110.,

Maoneek, N. Y., asslgnor New York,

N. Y., a corporation of Delaware No Drawing.

6 Claims.

The present invention relates to the production of basic aluminum chloride. More particularly, it relates to the production of basic aluminum chloride which is particularly adaptedfor use as a body deodorant.

Normal aluminum chloride is much used as on astringent type of body deodorant, but because oi its unusually high acidity it is harmful to clothing, particularly highly colored types, with the result that users or" such products must exercise unusual care to remove all surplus liquid irom the bod before dressing in order to avoid damage to clothing. Attempts have been made to remedy this situation by reducing the acidity oi the normal aluminum chloride solution by conit to the basic salt aluminum hydroxy ""IOWIL methods for the prove been very slow and have invariably resul in a very impure product,

which. has not M increased the cost of the final solution but has resulted in an impure solution.

it is an object oi present invention to provide a process of pro basic aluminum chloride salt which overcomes all of the foregoing deficiencies.

It is another object of the present invention to provide process of producing basic aluminum chloride salt which has an unusually high degree of purity.

It is a, still further object of the present inven provide a process of producing basic alumi lo lde salt at rapid rate and under conherwise economical.

traces of invention, out, will be apparent irom the following do what now consdered to duction oi" thi so?" tie Application December 31, 1943, Serial No. 516,539

I (oi. 22-92) J Ti e result solution will stirred at C. for approximately one hour at which time the aluminum hydroxide so formed is filtered oil and washed free from chlorides, such as ammonium chloride. The existence of. ammonium chloride in would result in the production of aluminum oxides which would be insoluble in the solution and produce a milky and unsightly solution.

The moist, washed aluminum hydroxide gel is then introduced into an aluminum chloride solution, heated to approximately C., and the heating continued with stirring until the solution clears, which will occur in approximately fifteen hours. The aluminum hydroxide is preferably in excess in this step and the excess aluminum hydroxide after the completion of the swp is filtered on" and reused. The solution is then cooled to approximately 25 C, and sufiicient water added to adjust the specific gravity of the solution to 1.26 at 25 0. Under these conditions the resulting solution will be found to have a pH of 1.8. Control of the hydrogen ion concentration to approximately this value eliminates substantially all free aluminum chloride from the solution in the combined form of the basic salt. The solute of the solution consists of substantially pure basic aluminum chloride which can be used in desired concentration as an astringent to act as a body deodorant.

By way of explanation of the invention, and not in limitation thereof, the following specific examples of a process or" the invention will be given:

Escmylc #1 20s lbs. of aluminum chloride crystals (Ali'lis. EH20) are dissolved in gallons of water, heated to 75 C. and then treated with ammonium hydronide until very slightly alkaline to litmus. This mixture is heated and stirred at 75 C. for i o e-minimi hydroxide is filtered on" and rree from "*ilorides.

moist hedpreci is lntro-= ""ur 113321 chloride solution made oi aluminum chic-dc cure of water at 39 C.

. 2.1.115 ta es about ten cooled to e he are.

chloride solution at iii) C, and stirred a the aluminum hydroxide filtered sample shows a pH of 1.8 and specific gravity at 25 C. of 1.26. The mixture is cooled V rapidly and filtered with'the aid of any suitable filter media.

At least sumcient aluminum hydroxide gel is added to substantially react with the aluminum chloride in solution so as to reduce the acidity in the final product. The quantities of aluminum hydroxide gel and aluminum chloride and the conditions of reaction are such that the basic aluminum chloride having the formula A12C14(0H): is formed.

Since certain changes may be made in carrying out the above process without departing from the scope of the invention, it is intended that all ammonium hydroxide until the resulting solution is slightly alkaline to litmus, continuing the heating with vigorous stirring at approximately 90 C. for approximately one hour, filtering oil the aluminum hydroxide gel so formed, washing the filtered aluminum hydroxide gel free of chlorides and other impurities. introducing the purified aluminum hydroxide gel into an aluminum chloride solution heated to approximately 90 (2., continuing the heating with stirring until the solution clears, cooling the solution to approximately 75 C., and adding sufilclent water to the solution to adjust the specific gravity to 1.26 at 25 C.

2. The process of producing basic aluminum chloride having the formula A12C14(OH)2 which comprises reacting a purified, freshly prepared, wet aluminum hydroxide gel with an aluminum chloride solution heating to approximately 90 C., continuing the heating at that temperature while stirring until the solution reaches a pH of about 1.8, cooling the solution to approximately 25 c.

and adding sufiicient water to adjust the specific gravity to 1.26 at 25 C.

3. The process of producing a basic aluminum chloride composition suitable for use as a body deodorant which comprises adding at least the molecular equivalent amount of chloride free aluminum .hydroxide gel to a solution of normal aluminum chloride for the formation of the basic to a solution of normal aluminum chloride, agitating the mixture at a temperature of approximately C. for a suificient time until the pH of the solution is approximately 1.8 when the gravity is adjusted to about 1.26 at 25 C. and the solute of the solution consists of the substantially pure basic aluminum chloride and then filtering off the excess gel.

5. The process of producing a basic aluminum chloride composition suitable for use as a body deodorant which comprises adding substantially the molecular equivalent amount of chloride free aluminum hydroxide gel to a solution of normal aluminum chloride for the formation of the basic salt AlzCldOH): and agitating the mixture at a a temperature of approximately 90 C. for a sufiicient time until the pH of the solution is approximately 1.8 when the gravity is adjusted to about 1.26 at 25 C. and the solute of the solution consists of the substantially pure basic aluminum chloride. 9

6. The process of producing a basic aluminum chloride composition suitable for the use as a body deodorant which comprises adding at least a molecular equivalent of chloride freealuminum hydroxide gel to a solution of normal aluminum chloride to form the basic salt A12Cl4(OH)2 and agitating the mixture at a temperature of approximately 90 C. for a period of about fifteen hours.

ERNEST H. KASTNING. 

